Comment: There are problems with this . . .

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There are problems with this . . .

if events occured exactly as described in the news story link. The man was robbed, but wasn't in immediate danger when the two strangers found him. The strangers pursued the robber and then shot at him and the robber returned fire. The robber was hit by fire from the pursuing men.
Deadly force can only be used to defend life or limb that are under immediate threat. Having youre stuff taken isnt such a threat.

One can understand their motive, if this story is true. That given - they showed extremely poor judgement. If they would have killed the robber, they would be in deep trouble.

If they have any brains at all (which we can question) they will likely never reveal themselves.